A 1928 red seal two dollar bill is worth anywhere from $20 to around $150. The two dollar bills that were created with stars in the serial number are worth more.
The value of a 1928 red seal two dollar bill is somewhat dependent on how it has been circulated. A bill that is in nearly mint condition will sell for a higher price than one that has been in constant circulation. Two dollar bills with specialized serial numbers and stars in the serial numbers are more rare; so they will sell for much more than a typical red seal two dollar bill. The 1928 red seal two dollar bills that are worth the most are the ones that are both in mint condition and have a star in the serial number.